Die sinking, engraving, reproducing machine and the like



1. F. KELLER. v DIE SINKING, ENGRAVlNG, REPRODUCING-MACHINE AND THE LIKE.

APPLICATION FILED MAY 2, 1917. I

Patented Aug. .31, 1920,

5 SHEETSS HEEI l.

wmwsses INVENTOR J05EPH E KELLER.

, ,1. F. KELLER. DIE smxma, ENGRAVING, REPRODUCING MACHINE AND THE LIKE.

Patented Aug. 31, 1920..

5 SHEETS-SHEE] 2.

APPLICATMION FILED- MAY 2, 1917.

MIHHIHI.

7 nih WITNESSES l/L/JE/WUI? JOSEPH F". HELL 5/? I By 1 M LL LLLLL-W/W AFTOHILIEYS I J. F. KELLER. v DIE SINKING, ENGRAVING, REPRODUCING MACHINE AND THE LIKE'.

APPLlCATlON FILED MAY 2. 1917- Patented Aug. 31, 19,20

Il/VE/WOI? MUSE/=71 1 KELLER WITNESS-ES fiZ/WW mm,

J. F. KELLER. DIE SINKING, ENGRAVING, REPRODUCING MACHINE AND THE LIKE.

2 Y A M m N 0 H A m H P A 1 1 2 9 l 5 0d a, 1

Patented Aug. 31, 1920..

5 SHEETS-SHED 4.

WITNESSES %%z A TTOH/VEYS .I. F. KELLER. DIE SINKING, ENGRAVING REPRODUCING MACHINE AND THE LIKE.

Patenim Aug. 311920.,

5 SHEETSSHEEI 5.

APPLICATION FILED MAY 2, I9I7.

L35L221L WITNESSES QEJ I/VI/EA/FOR dust/ H r. KELL'I? UNITED STATES PA NT OFFICE;

.iosnrn r. KELLER, or NEW Yonx, N. Y., ASSIGNOR T KELLER MEGHA ENG-RAVING co, or :enooKLYN, NEW YORK, A CORPORATION or NE YORK.

'nm snixiNe, nNemviNe, nnrnonucme MACHINE AND THE LIKE.

Specification 01 Letters Patent. Patented Aug. 31, 1920.

Application filed Kay '2, 1917. Serial No. 165,871.

city, county, and State oft New Yon, have invented certain new and useful Improve- Y ments in Die Sinking, Engraving, Reproducing Machines and the like,.of which the following is a specification.

My invention relates to machines for engraving or sinking dies, or for reproducing in reliefor intagllo, and more-especially to ,such machines as are to be employed for reproducing from 'a templet, model or pattern on' either a reduced or an enlarged scale.

My invention has for its object to prov de a novel machine of the class specified WhlCll shall be comparatively simple in construction, have-a comparatlvely small number of parts and which shall at the same time be accurate and reliable.

More particularly still it is the ob ect of my invention to provide a machine of the character described in which the relative three dimensional motions which must take place, as between the tracer and cutter on the one hand and the pattern and the work on the other hand,fis' entirely due to or associated with a single carrier or operating bar of novel construction, both pattern and work remaining fixed, as orlginally set up, throughout the operation of the machine.

A further object of my invention is to provide a machine of the character specified, and having mynovel type of carrier or operating bar, especially suitable for engravin dies for use in the manufacture of antiskld and figured treads for automobile and bicycle tires and the like.

My novel form of carrier or operating bar may be embodied in a large variety of die sinking or reproducing machines for various usual or special purposes.

My lnvention will be better understood by referrin to the accompanyin drawings, in which igure 1 represents a ront elevation of a preferred form of my invention, as embodied in a machine for engraving dies used in the manufacture of anti-skid treads for Fig. 1; Fig. 5 is a view, taken from the right, of the end of Fig. 1; F ig. 6 is a front elevation showing the improved carrier bar of my nvention as embodied in a simple form ofdie sinkingmachine; and Figs. 7 and 8 are, respectively, front and side elevations of a simple form of verticaldie sinking or engraving machine embodying my improved carrier bar.

.In the drawings, Figs. 1 to 5 inclusive, a base 1 carries, at one end, a rear pedestal 2 and a front pedestal 3, the former being bored, in a plane transverse to the base and at an angle of about 45 with the vertical, to receive a shouldered stem or bearin 4, integrally a part of a revoluble turretlike mold carrier 5 provided with an annular flange 6 through which clamp screws 7 are threaded.

The mold carrier is provided with an annular rack 8, and adjacent faces of the mold carrier and-bearing 4, with respect to pedestal 3, are carefully fitted and finished for smooth and easy movement upon one another.

The upper surface of flange 6 is graduated and an index 9, mounted upon brackets 10 forming part of the pedestal or housing 2, is disposed adjacent thereto.

A worm 11, in mesh with rack 8, is also mounted in brackets 10 and forms part of a spindle 12 whose outer end is carried b another bracket 13, also attached to housing 2. A hand wheel 14 enables worm 11 to be -pivots 19 carried by folks 20 formed near one end and upon the lower side of a carrier or operating bar 21.

- The carrier bar, as here shown, is of T shaped section for the sake of stiffness and provided with reinforcing ribs 22, above the pivots.

Suitable portions of the horizontal web of. the T bar are faced, and preferably given a dove-tailed section, and upon these portions are mounted the longitudinal slidable cutter carrier 23 and the tracer carrier24.

The cutter carrier is provided with a rearwardlyg projected bracket 25 which is vertically bored for a spindle carrying a cutter 26-and a. grooved pulley 27. Similarly the tracer carrier carries a suitably bored bracket in which is held the fixed but vertically adjustable' tracer point 28..

Cutter carrier 23 is also provided with a bracket upon which is pivotally mounted a lever 29, the lower and shorter arm of which is pivotally connected with a link 30 whose 'other end 1s ivotally attached at 31 to a lug formed on t e carrier bar 21. The other end of lever 29 is slotted and pivotally joined to a link 32 whose outer end is similarly pivoted at 33 to a tracer carrier 24.

Link 32 is. three times the length of'link 30, and the :longer arm of lever 29 is three timesthe length of the shorter arm, the disl as tance in each case being taken between the ivotal points which have been referred to. he cutter and tracer are also so positionedthat, in any given position of links 30 and 32 and of lever 29, the distance between cutter. and tracer is three times that between the cutter and the line of the pivots 19.

Under these circumstances, geometrical considerations show that for every position of the cutter and tracer carriers the distance between cutter and tracer will always be three times that between'cutter'and pivots Q 19, or, in other words, that the distance be- I tween pivots-19 and the tracer will always be four times that between pivots and cutter. 40.

- third pedestal 34 in the top of which are 'At the tracer end of the .machine is a formed transverse undercut slideways to receive a similarly formed slidable pattern carrier 35, a screw 36, adapted to receive a suitable handle, being used to effect its slidingmotion. 4

. At the outer margin ofpedestal 34 is another transverse slideway 37 upon which is mounted a slide 38 carrying a pin 39. This slide is provided with'a. rack onits under surface which is in mesh with a pinion 40 adapted to be; rotated by means ofa hand wheel 41. A

39 lies loosely between a pair of transversely' spaced rollers 42 carried upon arms 43 fixed to the lower side of the carrier bar 21.

-Mounte'd upon the left hand end e f-the carrier bar is a motor 44 provided with a pulley 45. Idlerpulleys 46, 47 and 48 are carried upon other brackets appropriately A belt 50 passes from. the motor pulley lug formed on the around pulleys 46, 47, the cutter pulley 27 idler pulley 49 and idler pulley 48 back to pulley 45.

It will be noted that idler pulleys47 and 48, are, respectively, adjacent to opposite edges of the carrier bar, thus enabling the belt 50 to be given an S shaped loop over the idler pulley 49 and the cutter pulley 27 ,,both carried by the cutter carrier 22. As the cutter carrier is moved to or'fro longitudinally on the carrier bar, therefore, the a 8 loop moves with it without either tighteningr or slackening the belt.

racer carrier 24 is provided with an underneath rack 51 in mesh with a pinion 52 stood that this die represents onlyhalf of the entire mold or die necessary for the manufacture of atire, the other half die being exactly the same. In this die only the annular strip lying betweenjthe diametral planes passing through points 55 and 56 corresponds to the tread prr iper and is to be en aved.

attern 57 is 'held inpattern carrier 35 by means of set screws, 58 or in any other preferred manner. I

In setting up the machine and getting ready-for the engravingof a die, the die block 54 should, of eourse, first have the semi-circularly sectio ed annulus, whose surface is to be engra ed, turned out upon a lathe or formed in any other preferred way. Furthermore, the pattern 57 should be' so adjusted, transversely of .the machine, that when the tracer point is immediately above the center of thepattern, the cutter pomt will be immediately above the periphe of channel or annulus to be engraved w ich lies midway between the planes of points 55 and 56.

Preferably, the height of the pattern should be so adjusted that the lowest pomt of the die, the lowest point of the pattern, .the "cutter point, the tracer point and. the

point in which the axis of pivots 19 intersects the vertical axis of carrier arm bearing 17, all lie in one and the same straight line parallel with the line of travel of the cutter carrier 23 and tracer carrier 24 longitudinally upon the carrier arm. --However, .should either the die or the pattern, .or both, be above or below this line, the cutter or tracer, or both, may becorrespondingly adjusted vertically in their ,IGSPGCtlVB carriers without substantially varying theaccuracy with which the cutter will reproduce the pattern.

. The outboard or excess weight of the carrier arm is counterbalanced by a weight--59 at the endof the cord 60 attached-to the change or adjust the cutter or tracer or to inspect the work, change the patternand the like. 1

The machine havin been set up, as above described, the operatlon of the same is as follows: The hand wheel 14 is rotated so as to bring the index 9 opposite one of the main or longer divisions of the graduations of the mold carrier. The motor circuit is closed, thus revolving the cutter 26. By

. now suitably rotating the hand wheel 41,

slide 38 may be moved transversely so as to sweep the cutter and tracer points transversely across the die and pattern respectively by means of the pin 39-which presses against one or the other of the rollers 42, hung from the bottom of the carrier bar, and thereby'rotates the carrier bar about the axis of its bearing 17. The tracer 28 will follow the contour of the pattern, thus raising the carrier bar or permitting it to lower about the axis of pivots 19 as the irregularities or variations of the pattern may require. The cutter will, therefore, en-

' grave the surface of the die along a line corresponding to the particular line of the pattern which is being traced but the length of this line as well as the depth of the cutting will be reduced, as to the corresponding dimensions of the pattern, in the ratio of l to 4. The hand wheel 53 may then be rotated 1 through a small angle,thereby shifting both cutter and tracer longitudinally upon the .carrier arm, the extent of movement of the cutter being but one-fourth that of the tracer, however, and the next adjacent line of pattern and'die surface be swept over the hand wheel 41 now being turned in the opposite direction; and this operation may be repeated until the entire surface of the pattern ha ubeen covered and the 'corresponding 'sufrface Oflthe die has been engraved.-

If preferred, the successive lines ,of die and pattern sweptover may be longitudinal insteadoftransverse. In such case the continued movement of the cutter and tracer POl-IltSJS obtained by a continued rotation of the hand wheel 53 while the intermittentmovement necessary to bring the cutter and tracer over adjacent lines is obtained by intermittent rotation of hand wheel 41.

Instead of cutting or engraving the die by a systematic sweeping of its surface, as above described, the operator may, if he prefers, proceed irregularly by rotatin' either or both hand wheels 41 and 53 at will? In this way parts of the figure to be en-' graved, which relatively involve more and it ner detail, may be given correspondingly more attention.

Anti-skid and other figured automobile tires'are, as is well known, usually provided with a per1pheral design which consists of a repetltion of some elemental design; thus, for example, where the main design is a chain encircling the tread, the elemental des gn will be a group of links, the component partsof which are definitely related to'one another. In engraving the .die, therefore, it

is merely necessary that the pattern should embody this elemental design. When a" be accurately performed by the aid of the graduated flange 6 and the index 9.

As above described, the reproduction will have dimensions which are accurately one fourth those of. the pattern. Inasmuch, however, as the size or dimensions of the finished work is generally of the utmost importance and as the pattern, which, is often made of plaster or of some easily workable composition, may easily turn out to be a little smaller or a little larger than it was intended to be, it is desirable to so arrange that any such error may be compensated for.

This I do by means of the slots 64, 64, formed respectively in the outer end of the longer arm of lever 29 and in one end of link 30. By slightly shifting the point of connection of link 32 in theone slot and of leverf29 in the other slot so as to shorten or lengthen the longer arm of lever 29 and the link 30 by the same roportionate amount, the tracer "point Wlfi be correspondingly moved a little farther away from, or a little nearer to, the cutter point, and the ratio of reproduction, similarly, slightly changed. For this purpose suitable graduations may be placed uponlever 29 and link 30 adja-' cent to the slots.

Fig. 6'shows my improved carrier bar embodiedin a very simple form of plain die sinking or engraving machine. Here the carrier bar 21 is shown as circular in crosssection and provided near one end with a bifurcated bracket 65 whose extremities are pivoted to atransverse bearing 66 which is itself pivoted between vertically disposed center points held by a bearing bracket 67. This bracket is pivotally supported upon an axis 67 passing throughthe intersection of the axes about which carrier bar 21 is movable, the operating oint of center 26 and the contact point 0 tracer 28. A clamp. screw 67 passin through a slot in bracket 67 and threaded into the extension 67 fixed to base 1, enables the bracket 67 to be fixed in any chosen position.

Carrier arm 21, instead of being counterbalancedby a cord and. weight, asin the machine of Figs. 1 to 5, is provided ,with a weight 68 suitably fixed and located upon "the arm itself.

The arrangement of tracer, cutter, tracer carrier, cutter carrier, magnifying lever and links, driving pulleys and other operative parts, is substantially the same as in the earlier described machine. The arrangement for .movin the tracer and cutter carrier longitudina y and for swinging the carrier bar transversely is, however, much more simple in the machine now being discussed than in the. previous machine since it comprises merely ahandle 69 attached to the tracer carrier. y means of this handle the operator swings the carrier bar in and out transversely and slides the tracer carrier, and hence the cutter. carrier, back and forth longitudinally. Y

It is clear that the type of machine shown in Fig. 6 may take a variety of other forms and that it is immaterial whether the sweeping motion which the carrier bar makes arallel with the-faces of pattern and die ein a horizontal plane as shownin Fig.- 6, in a vertical plane about an upper or lower pivot, or in a vertical-plane. about a pivot at one side or the otherline passing through the intersection of In Figs. 7 and 8 are shown, respectively,- front and side elevations of still another simple "form of die sinking or engraving machine embodying my improved carrier bar. Here thebar hangs centrally'from-a bracket-70, one endof which is pivoted to swing about a horizontal transverse axis 71, while the other end carries the motor- 44. The axis 71 includes'a block 72- which is itself pivoted between horizontally disposed centers 73 at right. angles to said axis and carried by the main frame ofthe machine. A'balancin'g weight 74 is fixed upon an out board'extension of bracket Tracer point 28 and cutter 26 are held, by"

tracer carrierand cutter carrier respectively, parallel to the carrier arm and in a axis 71 with the line of centers 73.

= The operator controls the'movement of the cutter by the handle 69, through 'which' he causes the tracer point to move over the' surface of the pattern, thereby correspond;

. 'ingly moving the cutter point-over thev surface ofthe die. i

As the maximum a la-r movement of the carriar arm, withreference to the vertical,

assign a is comparatively small, no provision has been made in this form; of the machinefor com.- pensating for any tightening or slackemng of the driving belt, as it is believed that this will bebut trifling and of no practical importance. vCompensating means may easily be arranged, however, by those skilled m-the .art.'.

The. several I machines above described have all been arranged for a ratio of reproduction of 1 to 4. It is clear, however,

thatthe principle of my invention does not require that any particularratio of reproduction is employed; on the contrary the invention may be readily ada ted to any desired ratio of reproduction. imilarly, while the described machines are all arranged to reproduce the dies on a smaller scale than the pattern, it is merely'necessaryto exchange the pattern and the die and to make some triflmg corresponding changes in the operative parts, such changes be' easily within the ability of those skllled in t e art, to cause the reproduction to be on a larger scale than.

Havlng described In invention, I claim:

- 1. In amachine of t e character described,

acarrier bar mounted to s about a umversal joint, a tracer point and a cutter, both' slidably mounted upon saidbar, and means connectingxiaaracer point and cutter whereby they can slid simultaneously, the ratio of the distances of the tracer point and the cutter'respectively from the center of the joint remaining constant for all positions of said tracer point and cutter.

2. In a machine of the character described, a carrier bar mounted to swing about a universal joint, a tracer'point member and a cutter member both slidably mounted upon said members, and a pair of links'pivotally attached respectively between an end of the lever and the barand betweenthe other end of the lever and the remaining member.

said bar, a'lever pivotally attached to one of .3. In a machine of the character described,

a carrier bar mounted to swing about a umyersal joint, a tracer point member and a cuttermember both slidably mounted upon said bar, a. lever pivotally attached to oneof said members, and'a air of links pivotally attached respectively etween an end of the 9 lever and the bar and between the'other end of the bar and the remaining member, tlie ratio of the lengths of the links-to one another being the same as that of their. adjacent lever arms.

. 4; In a machine of the character described,

a carrier bar mounted to swing about a un1 versal joint, a tracer point and a rotatable pulley provided cutter, both slidably mounted upon said bar, the cutter being between said joint and tracer point, means for simultaneously sliding cutter and tracer point through distances respectively proportional to their distances from the center of the joint, a motor provided with a pulley and fixed uponsaid bar, and idler pulleys respectively fixed to the bar between tracer point and cutter and to the cutter mounting between cutter axis and motor.

5. In a machine of thecharacter described, a carrier bar mounted to swing about a universal joint, a tracer point member and a cutter member both slidably mounted upon said bar, a lever pivotally attached to one of said members, a pair of links pivotally attached respectively between an end of the lever and the bar and between the other end of the bar and the remaining member, the ratio of the lengths of the links to one another being the same as that of their adjacent lever arms, and cooperating rack and pinion members attached one to the tracer point mounting and one to the carrier bar. I 6. In a machine for sinking tire molds, a pattern carrier, a rotatable mold carrier hav- 111g its face inclined to the plane of the pattern carrier face, a carrier bar, a universal joint for said bar adjacent to the mold carrier on the side remote from the pattern carrier a tracer point and a cutter both slidably held upon said bar normal thereto and parallel to one another, the former above the pattern carrier and the latter above the mold carrier, and means for simultaneously sliding tracer point and cutter through distances respectively proportional to their distances from the center of the joint.

7. In a machine for sinking tire molds, a pattern carrier, a rotatable mold carrier having its taco inclined to the plane of the pattern carrier'face means for intermittently rotating the mold carrier through successive equal angles, a carrier bar, a universal joint for said bar adjacent to the mold carrier on the side remote from the pattern carrier, a tracer point and a cutter both slidably held upon said bar normal thereto and parallel to one another, the former above the pattern carrier and the latter above the mold carrier, and means for simultaneously sliding tracer point and cutter through distances respec* tively proportional to their distances from the center of the joint.

8. In a machine for sinking tire molds, a pattern carrier, a rotatable mold carrier having its face inclined to the plane of the pattern carrier face and provided with graduations, means for intermittently rotating the mold carrier through measured angles as de termined by the graduations, a carrier bar, a

universal joint for said bar adjacent to the mold carrier on the side remote from the pattern carrier, a tracer point and a cutter both slidably held upon said bar normal thereto and parallel to one another, the

. former above thepattern carrier and the latter above the mold carrier, and means for simultaneously sliding tracer point and cutter through distances respectively proportional to their distances from the center of the joint.

9. In a machine of the character described,

a carrier bar mounted to swing about a uni-- versal joint, a tracer point and a rotatable pulley-provided cutter both slidably mount- .ed upon said bar, means for simultaneously Josnrn F. names. 

